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Why does engine shake at idle, low RPMs, but will accelerate fine when kicked down?

Tiny
HAMPTON77
  • MEMBER
  • 1993 TOYOTA CAMRY
  • 155,000 MILES
The car starts fine. Idles rough. I can kick down the gas pedal and accelerate fine. When the car settles to low RPMs at speed it feels jerky. I was able to get this to stop at first by stomping the pedal, but now it will not stop.
Thursday, March 22nd, 2012 AT 1:39 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,230 POSTS
Check for vacuum leaks and check the IAC
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Thursday, March 22nd, 2012 AT 1:39 AM
Tiny
HAMPTON77
  • MEMBER
  • 4 POSTS
What is the IAC?
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Thursday, March 22nd, 2012 AT 1:42 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,230 POSTS
Idle air control valve. It is responsible for the engine idle.
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Thursday, March 22nd, 2012 AT 1:46 AM
Tiny
HAMPTON77
  • MEMBER
  • 4 POSTS
I didn't mention that I am not getting a check engine light. Does this mean anything more?
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Thursday, March 22nd, 2012 AT 2:07 AM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
When its idling poor or low try taping on the idle air control motor. Its under the throttle body. Thay are known to stick and do just that.
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Friday, March 30th, 2012 AT 4:34 PM

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